OK, let's crack this. We're given 129 and our task is to multiply it by 236. Essentially, we'll be adding 129 to itself 236 times.
Step 1: 0 + 129 = 129
Step 2: 129 + 129 = 258
Step 3: 258 + 129 = 387
Step 4: 387 + 129 = 516
Step 5: 516 + 129 = 645
Step 6: 645 + 129 = 774
Step 7: 774 + 129 = 903
Step 8: 903 + 129 = 1032
Step 9: 1032 + 129 = 1161
Step 10: 1161 + 129 = 1290
Step 11: 1290 + 129 = 1419
Step 12: 1419 + 129 = 1548
Step 13: 1548 + 129 = 1677
Step 14: 1677 + 129 = 1806
Step 15: 1806 + 129 = 1935
Step 16: 1935 + 129 = 2064
Step 17: 2064 + 129 = 2193
Step 18: 2193 + 129 = 2322
Step 19: 2322 + 129 = 2451
Step 20: 2451 + 129 = 2580
Step 21: 2580 + 129 = 2709
Step 22: 2709 + 129 = 2838
Step 23: 2838 + 129 = 2967
Step 24: 2967 + 129 = 3096
Step 25: 3096 + 129 = 3225
Step 26: 3225 + 129 = 3354
Step 27: 3354 + 129 = 3483
Step 28: 3483 + 129 = 3612
Step 29: 3612 + 129 = 3741
Step 30: 3741 + 129 = 3870
Step 31: 3870 + 129 = 3999
Step 32: 3999 + 129 = 4128
Step 33: 4128 + 129 = 4257
Step 34: 4257 + 129 = 4386
Step 35: 4386 + 129 = 4515
Step 36: 4515 + 129 = 4644
Step 37: 4644 + 129 = 4773
Step 38: 4773 + 129 = 4902
Step 39: 4902 + 129 = 5031
Step 40: 5031 + 129 = 5160
Step 41: 5160 + 129 = 5289
Step 42: 5289 + 129 = 5418
Step 43: 5418 + 129 = 5547
Step 44: 5547 + 129 = 5676
Step 45: 5676 + 129 = 5805
Step 46: 5805 + 129 = 5934
Step 47: 5934 + 129 = 6063
Step 48: 6063 + 129 = 6192
Step 49: 6192 + 129 = 6321
Step 50: 6321 + 129 = 6450
Step 51: 6450 + 129 = 6579
Step 52: 6579 + 129 = 6708
Step 53: 6708 + 129 = 6837
Step 54: 6837 + 129 = 6966
Step 55: 6966 + 129 = 7095
Step 56: 7095 + 129 = 7224
Step 57: 7224 + 129 = 7353
Step 58: 7353 + 129 = 7482
Step 59: 7482 + 129 = 7611
Step 60: 7611 + 129 = 7740
Step 61: 7740 + 129 = 7869
Step 62: 7869 + 129 = 7998
Step 63: 7998 + 129 = 8127
Step 64: 8127 + 129 = 8256
Step 65: 8256 + 129 = 8385
Step 66: 8385 + 129 = 8514
Step 67: 8514 + 129 = 8643
Step 68: 8643 + 129 = 8772
Step 69: 8772 + 129 = 8901
Step 70: 8901 + 129 = 9030
Step 71: 9030 + 129 = 9159
Step 72: 9159 + 129 = 9288
Step 73: 9288 + 129 = 9417
Step 74: 9417 + 129 = 9546
Step 75: 9546 + 129 = 9675
Step 76: 9675 + 129 = 9804
Step 77: 9804 + 129 = 9933
Step 78: 9933 + 129 = 10062
Step 79: 10062 + 129 = 10191
Step 80: 10191 + 129 = 10320
Step 81: 10320 + 129 = 10449
Step 82: 10449 + 129 = 10578
Step 83: 10578 + 129 = 10707
Step 84: 10707 + 129 = 10836
Step 85: 10836 + 129 = 10965
Step 86: 10965 + 129 = 11094
Step 87: 11094 + 129 = 11223
Step 88: 11223 + 129 = 11352
Step 89: 11352 + 129 = 11481
Step 90: 11481 + 129 = 11610
Step 91: 11610 + 129 = 11739
Step 92: 11739 + 129 = 11868
Step 93: 11868 + 129 = 11997
Step 94: 11997 + 129 = 12126
Step 95: 12126 + 129 = 12255
Step 96: 12255 + 129 = 12384
Step 97: 12384 + 129 = 12513
Step 98: 12513 + 129 = 12642
Step 99: 12642 + 129 = 12771
Step 100: 12771 + 129 = 12900
Step 101: 12900 + 129 = 13029
Step 102: 13029 + 129 = 13158
Step 103: 13158 + 129 = 13287
Step 104: 13287 + 129 = 13416
Step 105: 13416 + 129 = 13545
Step 106: 13545 + 129 = 13674
Step 107: 13674 + 129 = 13803
Step 108: 13803 + 129 = 13932
Step 109: 13932 + 129 = 14061
Step 110: 14061 + 129 = 14190
Step 111: 14190 + 129 = 14319
Step 112: 14319 + 129 = 14448
Step 113: 14448 + 129 = 14577
Step 114: 14577 + 129 = 14706
Step 115: 14706 + 129 = 14835
Step 116: 14835 + 129 = 14964
Step 117: 14964 + 129 = 15093
Step 118: 15093 + 129 = 15222
Step 119: 15222 + 129 = 15351
Step 120: 15351 + 129 = 15480
Step 121: 15480 + 129 = 15609
Step 122: 15609 + 129 = 15738
Step 123: 15738 + 129 = 15867
Step 124: 15867 + 129 = 15996
Step 125: 15996 + 129 = 16125
Step 126: 16125 + 129 = 16254
Step 127: 16254 + 129 = 16383
Step 128: 16383 + 129 = 16512
Step 129: 16512 + 129 = 16641
Step 130: 16641 + 129 = 16770
Step 131: 16770 + 129 = 16899
Step 132: 16899 + 129 = 17028
Step 133: 17028 + 129 = 17157
Step 134: 17157 + 129 = 17286
Step 135: 17286 + 129 = 17415
Step 136: 17415 + 129 = 17544
Step 137: 17544 + 129 = 17673
Step 138: 17673 + 129 = 17802
Step 139: 17802 + 129 = 17931
Step 140: 17931 + 129 = 18060
Step 141: 18060 + 129 = 18189
Step 142: 18189 + 129 = 18318
Step 143: 18318 + 129 = 18447
Step 144: 18447 + 129 = 18576
Step 145: 18576 + 129 = 18705
Step 146: 18705 + 129 = 18834
Step 147: 18834 + 129 = 18963
Step 148: 18963 + 129 = 19092
Step 149: 19092 + 129 = 19221
Step 150: 19221 + 129 = 19350
Step 151: 19350 + 129 = 19479
Step 152: 19479 + 129 = 19608
Step 153: 19608 + 129 = 19737
Step 154: 19737 + 129 = 19866
Step 155: 19866 + 129 = 19995
Step 156: 19995 + 129 = 20124
Step 157: 20124 + 129 = 20253
Step 158: 20253 + 129 = 20382
Step 159: 20382 + 129 = 20511
Step 160: 20511 + 129 = 20640
Step 161: 20640 + 129 = 20769
Step 162: 20769 + 129 = 20898
Step 163: 20898 + 129 = 21027
Step 164: 21027 + 129 = 21156
Step 165: 21156 + 129 = 21285
Step 166: 21285 + 129 = 21414
Step 167: 21414 + 129 = 21543
Step 168: 21543 + 129 = 21672
Step 169: 21672 + 129 = 21801
Step 170: 21801 + 129 = 21930
Step 171: 21930 + 129 = 22059
Step 172: 22059 + 129 = 22188
Step 173: 22188 + 129 = 22317
Step 174: 22317 + 129 = 22446
Step 175: 22446 + 129 = 22575
Step 176: 22575 + 129 = 22704
Step 177: 22704 + 129 = 22833
Step 178: 22833 + 129 = 22962
Step 179: 22962 + 129 = 23091
Step 180: 23091 + 129 = 23220
Step 181: 23220 + 129 = 23349
Step 182: 23349 + 129 = 23478
Step 183: 23478 + 129 = 23607
Step 184: 23607 + 129 = 23736
Step 185: 23736 + 129 = 23865
Step 186: 23865 + 129 = 23994
Step 187: 23994 + 129 = 24123
Step 188: 24123 + 129 = 24252
Step 189: 24252 + 129 = 24381
Step 190: 24381 + 129 = 24510
Step 191: 24510 + 129 = 24639
Step 192: 24639 + 129 = 24768
Step 193: 24768 + 129 = 24897
Step 194: 24897 + 129 = 25026
Step 195: 25026 + 129 = 25155
Step 196: 25155 + 129 = 25284
Step 197: 25284 + 129 = 25413
Step 198: 25413 + 129 = 25542
Step 199: 25542 + 129 = 25671
Step 200: 25671 + 129 = 25800
Step 201: 25800 + 129 = 25929
Step 202: 25929 + 129 = 26058
Step 203: 26058 + 129 = 26187
Step 204: 26187 + 129 = 26316
Step 205: 26316 + 129 = 26445
Step 206: 26445 + 129 = 26574
Step 207: 26574 + 129 = 26703
Step 208: 26703 + 129 = 26832
Step 209: 26832 + 129 = 26961
Step 210: 26961 + 129 = 27090
Step 211: 27090 + 129 = 27219
Step 212: 27219 + 129 = 27348
Step 213: 27348 + 129 = 27477
Step 214: 27477 + 129 = 27606
Step 215: 27606 + 129 = 27735
Step 216: 27735 + 129 = 27864
Step 217: 27864 + 129 = 27993
Step 218: 27993 + 129 = 28122
Step 219: 28122 + 129 = 28251
Step 220: 28251 + 129 = 28380
Step 221: 28380 + 129 = 28509
Step 222: 28509 + 129 = 28638
Step 223: 28638 + 129 = 28767
Step 224: 28767 + 129 = 28896
Step 225: 28896 + 129 = 29025
Step 226: 29025 + 129 = 29154
Step 227: 29154 + 129 = 29283
Step 228: 29283 + 129 = 29412
Step 229: 29412 + 129 = 29541
Step 230: 29541 + 129 = 29670
Step 231: 29670 + 129 = 29799
Step 232: 29799 + 129 = 29928
Step 233: 29928 + 129 = 30057
Step 234: 30057 + 129 = 30186
Step 235: 30186 + 129 = 30315
Step 236: 30315 + 129 = 30444

So, 129*236 = 30444